<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning" show-icon :closable="false">
            </el-alert>
            <!-- 分类选择区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 级联选择器 -->
                   
                    <el-cascader
                        v-model="sleectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                    
                </el-col>
            </el-row>
            <!-- tab
             页签区域 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">
                 <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加动态参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展出行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    v-if="scope.row.inputVisible" class="input-new-tag"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    ></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" 
                                size= "mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" 
                                size= "mini" icon="el-icon-delete"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加静态属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                    @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展出行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    v-if="scope.row.inputVisible" class="input-new-tag"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    ></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" 
                                size= "mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" 
                                size= "mini" icon="el-icon-delete"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加属性参数对话框 -->
        <el-dialog
            :title="'添加'+ titleText"
            :visible.sync="addDialogVisible"
            width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog
            :title="'修改'+ titleText"
            :visible.sync="editDialogVisible"
            width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return {
            cateList: [],
            // 级联选择器的配置项
            cateProps: {
                expandTrigger: 'hover' ,
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择器的选中项的双向绑定
            sleectedCateKeys: [],
            // 被激活页签的名称
            activeName: 'many',
            manyTableData: [],
            onlyTableData: [],
            addDialogVisible: false,
            // 添加表单
            addForm: {
                attr_name:''
            },
            // 添加表单验证规则对象
            addFormRules: {
                attr_name: [
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
            editDialogVisible: false,
            editForm: {
                attr_name:''
            },
            // 修改表单验证规则对象
            editFormRules: {
                attr_name: [
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
            // // 控制按钮与文本框的切换显示
            // inputVisible: false,
            // // 文本框中输入的内容
            // inputValue: '',
        }
    },
    created(){
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类列表
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error("获取商品列表分类失败！")
            }
            this.cateList = res.data
            console.log(this.cateList)
        },
        // 级联选择器的选项变化时的事件
        handleChange(){
            this.getParams()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName)
            this.getParams()
        },
        async getParams(){
            // 证明选中的不是三级分类
            if(this.sleectedCateKeys.length !== 3){
                this.sleectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            console.log(this.sleectedCateKeys)
            // 根据所选id，和当前所处的面板获取对应的参数列表
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: {sel: this.activeName}
            })
            if(res.meta.status !== 200){
                return this.$message.error("获取参数列表失败")
            }
            res.data.forEach(element => {
                element.attr_vals = element.attr_vals ?element.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                element.inputVisible = false
                // 文本框中输入的值
                element.inputValue = ''
            });
            console.log(res.data)
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击添加参数
        addParams(){
            this.$refs.addFormRef.validate(async val => {
                if(!val) return this.$message.error("未通过验证")
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201){
                    this.$message.error("添加参数失败")
                }
                this.addDialogVisible = false
                this.getParams()
                this.$message.success("添加参数成功")
            })
        },
        // 点击按钮，展示修改的对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                params: {
                    attr_sel: this.activeName
                }
            })
            if(res.meta.status !== 200){
                return this.$message.error("获取当前参数信息失败")
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 监听关闭事件清空数据域
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async val => {
                if(!val) return
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 200){
                    return this.$message.error("修改信息失败")
                }
                this.$message.success("修改信息成功")
                this.getParams()
                this.editDialogVisible = false
            })
        },
        // 删除参数
        removeParams(attr_id){
            this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(async () => {
                // 写确认删除的业务逻辑,即发送删除请求
                const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                if(res.meta.status !== 200){
                    return this.$message.error("删除失败")
                }
                this.$message({
                    type: 'success',
                    message: '删除成功!'
                });
                this.getParams()
            }).catch(() => {
            this.$message({
                type: 'info',
                message: '已取消删除'
            });          
        });
        },
        //  文本框是去焦点，或按下enter
        async handleInputConfirm(row){
            // console.log('ok')
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        // 将对attr_vals的添加和删除操作，保存到数据库中
        async saveAttrVals(row){
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error("修改参数项失败！")
            }
            this.$message.success("修改参数项成功！")
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true // 此时并未渲染出input元素
            // 让文本框自动获得焦点
            // $nextTick方法的作用：就是当页面上的元素被重新渲染之后，才会执行里面的回调函数
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除tag标签
        handleClose(i, row){
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },
    // 计算属性
    computed: {
        // 如果按钮需要被禁用，返回true，否则返回false
        isBtnDisabled(){
            if(this.sleectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类id
        cateId(){
            if(this.sleectedCateKeys.length === 3){
                return this.sleectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本额
        titleText(){
            if(this.activeName === "many"){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>